Police in Pakistan say gunmen have killed at least six people, including a United Nations employee, in two attacks in southwest Pakistan.

Police said gunmen opened fire on a vehicle carrying local employees of the UN Food and Agriculture Organization as they drove through Balochistan Province's Mastung district, killing two local staffers and wounding one.

Also on March 29, police said gunmen on motorcycles opened fire on a passenger van in the provincial capital, Quetta, killing at least four Shi'ite Muslims and wounding four others in an apparent sectarian attack.

There has so far been no claim of responsibility for the attacks.

Balochistan has seen a decades-long insurgency by nationalists demanding greater autonomy.